PT4115 PDF

PT – LED Driver with Dimming. PTB89E Package SOT PT – LED Driver with Dimming Downloads. PT Datasheet. Description. LEDs need constant current, for example normal LED has mA constant current, but V varying voltage, this board do this kind of work. So I built a pt circuit to control my LEDs! it has a Ohm resistor so it should give me ~ma of current!.

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SW pin is grounded If you see a short then we can say that the IC is broken.

I’ve checked all parts a hundred times. It showed about mA.

PT Led diver | Page 2 | All About Circuits

I’m still working with smaller LED’s in Joule thief circuits as once you go over ma you are using as much as some light bulbs. Ph4115 some alcohol to remove the flux, then let it get good and dry, then try it again.

See also “Layout considerations” on page 14 of the datasheet. Sign up or log in Sign up using Google.

I use breadboard, but I must solder the chip cuz its smd. Posted by spinnaker in forum: Also, did the sparks occur during open circuit operation, or when the LED was connected? PT Led diver Reply to Thread. The inductor is also a long way from the chip and Vin also crosses v-out Can you add a picture of your circuit? Last chance;] I’m just hoping, the problem was a DC supply. Post Your Answer Discard By clicking “Post Your Answer”, you acknowledge that you have read our updated pt4151 of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies.

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It’s designed to drive an LED. Can you post pt411 bigger picture of the board. I didn’t connect it correctly. Below is the schematic and the PCB board: Tomorrow I’m gonna buy a few more. The chip should be ok, because I bought it in two different shops.

PT4115 – LED Driver with Dimming

BruceHsu So you used plumbing solder? One local shop, and one via net. Is it because I use lab power supply? Try to clean it very well. On the pics there are 2 different boards. You want those leads on your sense resistor much, much short. Gives You both the time to make secure meassurements and the ease to identify where the problem really is.

A oscillator might be able to control that. Your name or email address: I have no experience with buck convertors, what can be wrong?

Can you take a picture of the circuit for us? Could be bad chips.

Lt4115 3, But, only for a few p4115, then it’s starting to burn Are you familiar with the toner transfer method? When I turn it off its making a short. By clicking “Post Your Answer”, you acknowledge that you have read our updated terms of serviceprivacy policy and cookie policyand that your continued use of the website is subject to these policies. It would seem that the coil value might change the current output too.

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The sparks are inductor’s way to keep the current on if all low voltage drop routes are off. Bruce Hsu 37 6. It also seems to me that I see a wisp of smoke drifting over that chip when the sparking stops.

To me it looks like there’s flux between the pins, and there’s current flowing through the flux. I will check your routing once I get home. Try 1 Ohm first. Sign up using Facebook. Can you give a schematic pt44115 your circuit? Here’s as simple a diagram as Pf4115 can make: I’ve had ma through a garden lamp F 4 pin chip, but that was pr4115 accident testing an LED in circuit. Post as a guest Name.

I thought that something conductive around these pins and start to conduct after 10 seconds. Sep 17, 8, 1, Yes, my password is: Ill take a pic tomorrow.

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